The MSD gives the typical average distance that a particle moves within a time \(t\) . For short times we see the ballistic behavior with \(\langle r(t^2) \rangle \sim t^2\)  [1]}. In the undeformed state (\(\dot{\gamma } t = 0\% \) ), unlike liquid, the MSD does not enter into the diffusive regime but instead shows a plateau at intermediate time. This is attributed to the so-called "cage effect" where the particle temporarily gets trapped by its neighbor. After a sufficiently long time, the cage is broken by thermal energy and the MSD crosses over to a time-dependent diffusive regime.
